问题
计算题
用简便方法计算。 | ||||
|
答案
(1)19.4-1.28-3.72
=19.4-5
=14.4
=1.25×8×(4×0.25)
=10
(3)31.7×0.9+3.17
=3.17×(9+1)
=31.7
=0.25×2×4.6
=23
材料分析题
用简便方法计算。 | ||||
|
(1)19.4-1.28-3.72
=19.4-5
=14.4
=1.25×8×(4×0.25)
=10
(3)31.7×0.9+3.17
=3.17×(9+1)
=31.7
=0.25×2×4.6
=23